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# config.py - Reading and writing Git config files
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# Copyright (C) 2011 Jelmer Vernooij <jelmer@samba.org>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; version 2
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# of the License or (at your option) a later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301, USA.
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"""Reading and writing Git configuration files.
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TODO:
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* preserve formatting when updating configuration files
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* treat subsection names as case-insensitive for [branch.foo] style
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subsections
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"""
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# Taken from dulwich not yet released 0.8.3 version (until it is actually
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# released)
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import errno
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import os
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import re
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from dulwich.file import GitFile
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class Config(object):
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"""A Git configuration."""
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def get(self, section, name):
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"""Retrieve the contents of a configuration setting.
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:param section: Tuple with section name and optional subsection namee
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:param subsection: Subsection name
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:return: Contents of the setting
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:raise KeyError: if the value is not set
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"""
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raise NotImplementedError(self.get)
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def get_boolean(self, section, name, default=None):
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"""Retrieve a configuration setting as boolean.
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:param section: Tuple with section name and optional subsection namee
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:param name: Name of the setting, including section and possible
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subsection.
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:return: Contents of the setting
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:raise KeyError: if the value is not set
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"""
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try:
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value = self.get(section, name)
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except KeyError:
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return default
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if value.lower() == "true":
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return True
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elif value.lower() == "false":
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return False
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raise ValueError("not a valid boolean string: %r" % value)
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def set(self, section, name, value):
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"""Set a configuration value.
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:param name: Name of the configuration value, including section
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and optional subsection
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:param: Value of the setting
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"""
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raise NotImplementedError(self.set)
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class ConfigDict(Config):
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"""Git configuration stored in a dictionary."""
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def __init__(self, values=None):
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"""Create a new ConfigDict."""
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if values is None:
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values = {}
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self._values = values
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def __repr__(self):
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return "%s(%r)" % (self.__class__.__name__, self._values)
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def __eq__(self, other):
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return (
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isinstance(other, self.__class__) and
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other._values == self._values)
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@classmethod
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def _parse_setting(cls, name):
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parts = name.split(".")
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if len(parts) == 3:
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return (parts[0], parts[1], parts[2])
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else:
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return (parts[0], None, parts[1])
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def get(self, section, name):
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if isinstance(section, basestring):
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section = (section, )
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if len(section) > 1:
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try:
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return self._values[section][name]
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except KeyError:
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pass
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return self._values[(section[0],)][name]
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def set(self, section, name, value):
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if isinstance(section, basestring):
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section = (section, )
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self._values.setdefault(section, {})[name] = value
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def _format_string(value):
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if (value.startswith(" ") or
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value.startswith("\t") or
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value.endswith(" ") or
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value.endswith("\t")):
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return '"%s"' % _escape_value(value)
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return _escape_value(value)
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def _parse_string(value):
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value = value.strip()
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ret = []
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block = []
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in_quotes = False
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for c in value:
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if c == "\"":
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in_quotes = (not in_quotes)
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ret.append(_unescape_value("".join(block)))
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block = []
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elif c in ("#", ";") and not in_quotes:
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# the rest of the line is a comment
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break
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else:
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block.append(c)
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if in_quotes:
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raise ValueError("value starts with quote but lacks end quote")
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ret.append(_unescape_value("".join(block)).rstrip())
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return "".join(ret)
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def _unescape_value(value):
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"""Unescape a value."""
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def unescape(c):
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return {
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"\\\\": "\\",
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"\\\"": "\"",
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"\\n": "\n",
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"\\t": "\t",
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"\\b": "\b",
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}[c.group(0)]
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return re.sub(r"(\\.)", unescape, value)
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def _escape_value(value):
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"""Escape a value."""
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return value.replace("\\", "\\\\").replace("\n", "\\n")\
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.replace("\t", "\\t").replace("\"", "\\\"")
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def _check_variable_name(name):
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for c in name:
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if not c.isalnum() and c != '-':
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return False
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return True
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def _check_section_name(name):
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for c in name:
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if not c.isalnum() and c not in ('-', '.'):
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return False
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return True
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def _strip_comments(line):
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line = line.split("#")[0]
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line = line.split(";")[0]
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return line
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class ConfigFile(ConfigDict):
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"""A Git configuration file, like .git/config or ~/.gitconfig.
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"""
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@classmethod
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def from_file(cls, f):
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"""Read configuration from a file-like object."""
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ret = cls()
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section = None
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setting = None
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for lineno, line in enumerate(f.readlines()):
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line = line.lstrip()
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if setting is None:
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if _strip_comments(line).strip() == "":
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continue
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if line[0] == "[":
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line = _strip_comments(line).rstrip()
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if line[-1] != "]":
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raise ValueError("expected trailing ]")
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key = line.strip()
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pts = key[1:-1].split(" ", 1)
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pts[0] = pts[0].lower()
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if len(pts) == 2:
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if pts[1][0] != "\"" or pts[1][-1] != "\"":
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raise ValueError(
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"Invalid subsection " + pts[1])
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else:
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pts[1] = pts[1][1:-1]
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if not _check_section_name(pts[0]):
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raise ValueError("invalid section name %s" %
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pts[0])
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section = (pts[0], pts[1])
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else:
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if not _check_section_name(pts[0]):
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raise ValueError("invalid section name %s" %
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pts[0])
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pts = pts[0].split(".", 1)
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if len(pts) == 2:
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section = (pts[0], pts[1])
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else:
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section = (pts[0], )
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ret._values[section] = {}
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else:
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if section is None:
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raise ValueError("setting %r without section" % line)
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try:
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setting, value = line.split("=", 1)
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except ValueError:
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setting = line
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value = "true"
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setting = setting.strip().lower()
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if not _check_variable_name(setting):
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raise ValueError("invalid variable name %s" % setting)
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if value.endswith("\\\n"):
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value = value[:-2]
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continuation = True
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else:
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continuation = False
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value = _parse_string(value)
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ret._values[section][setting] = value
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if not continuation:
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setting = None
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else: # continuation line
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if line.endswith("\\\n"):
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line = line[:-2]
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continuation = True
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else:
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continuation = False
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value = _parse_string(line)
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ret._values[section][setting] += value
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if not continuation:
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setting = None
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return ret
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@classmethod
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def from_path(cls, path):
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"""Read configuration from a file on disk."""
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f = GitFile(path, 'rb')
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try:
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ret = cls.from_file(f)
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ret.path = path
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return ret
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finally:
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f.close()
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def write_to_path(self, path=None):
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"""Write configuration to a file on disk."""
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if path is None:
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path = self.path
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f = GitFile(path, 'wb')
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try:
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self.write_to_file(f)
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finally:
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f.close()
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def write_to_file(self, f):
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"""Write configuration to a file-like object."""
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for section, values in self._values.iteritems():
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try:
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section_name, subsection_name = section
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except ValueError:
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(section_name, ) = section
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subsection_name = None
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if subsection_name is None:
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f.write("[%s]\n" % section_name)
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else:
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f.write("[%s \"%s\"]\n" % (section_name, subsection_name))
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for key, value in values.iteritems():
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f.write("%s = %s\n" % (key, _escape_value(value)))
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class StackedConfig(Config):
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"""Configuration which reads from multiple config files.."""
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def __init__(self, backends, writable=None):
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self.backends = backends
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self.writable = writable
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def __repr__(self):
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return "<%s for %r>" % (self.__class__.__name__, self.backends)
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@classmethod
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def default_backends(cls):
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"""Retrieve the default configuration.
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This will look in the repository configuration (if for_path is
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specified), the users' home directory and the system
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configuration.
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"""
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paths = []
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paths.append(os.path.expanduser("~/.gitconfig"))
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paths.append("/etc/gitconfig")
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backends = []
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for path in paths:
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try:
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cf = ConfigFile.from_path(path)
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except (IOError, OSError), e:
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if e.errno != errno.ENOENT:
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raise
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else:
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continue
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backends.append(cf)
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return backends
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def get(self, section, name):
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for backend in self.backends:
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try:
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return backend.get(section, name)
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except KeyError:
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pass
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raise KeyError(name)
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def set(self, section, name, value):
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if self.writable is None:
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raise NotImplementedError(self.set)
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return self.writable.set(section, name, value)
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